我國(guó)南方西南和中東部區(qū)域兩次持續(xù)性低溫雨雪過(guò)程與關(guān)鍵環(huán)流系統(tǒng)的關(guān)系研究

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我國(guó)南方西南和中東部區(qū)域兩次持續(xù)性低溫雨雪過(guò)程與關(guān)鍵環(huán)流系統(tǒng)的關(guān)系研究
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中圖分類(lèi)號(hào):P448
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2018YFC1505602); 國(guó)家自然科學(xué)基金資助項(xiàng)目(41705055);氣象軟科學(xué)重點(diǎn)課題(2021ZDIANXM22)

Study on the relationship between two persistent low temperature rain and snow processes of southwestern and central-eastern of southern China and key circulation systems

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利用NCEP再分析資料和國(guó)家氣象信息中心提供的753站逐日氣溫和降水資料,對(duì)比分析了我國(guó)南方西南和中東部區(qū)域兩次持續(xù)10 d以上的低溫雨雪過(guò)程,結(jié)果表明:(1)兩次過(guò)程中歐亞大陸中高緯東亞大槽均加深,但環(huán)流形勢(shì)有差異。西南過(guò)程呈現(xiàn)"北高南低"形勢(shì),關(guān)鍵脊區(qū)在貝加爾湖,而中東部區(qū)域過(guò)程"北高南低"和"西高東低"形勢(shì)共存,關(guān)鍵脊區(qū)從烏拉爾山延伸至貝加爾湖。兩次過(guò)程異常的環(huán)流與北大西洋向東傳播的波列有關(guān)。(2)西南過(guò)程關(guān)鍵脊區(qū)提前過(guò)程3 d發(fā)展并東移至貝加爾湖,形成穩(wěn)定形勢(shì);而中東部區(qū)域過(guò)程關(guān)鍵脊區(qū)提前過(guò)程一周發(fā)展,在開(kāi)始日達(dá)最強(qiáng)。兩次過(guò)程均伴隨蒙古高壓東移南壓使地面降溫,500 hPa關(guān)鍵脊區(qū)超前蒙古高壓2 d變化。西南過(guò)程降溫主要受到冷平流和絕熱冷卻影響,而中東部區(qū)域過(guò)程主要受到冷平流的影響。(3)西南過(guò)程水汽來(lái)自孟加拉灣,只受南支槽支配。中東部區(qū)域過(guò)程水汽來(lái)自孟加拉灣、南海和西太平洋,由南支槽和西太平副熱帶高壓的共同影響。兩次過(guò)程水汽正收支主要來(lái)自南邊界。

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By using the NCEP reanalysis data and the daily temperature and precipitation data of 753 stations provided by the China National Meteorological Information Center, two low temperature rain and snow processes lasting more than 10 days of southwestern and central-eastern of southern China were compared. Results show that: (1) both processes deepen the East Asian trough in the middle and high latitudes of Eurasia, but there are differences in the circulation situation. The southwestern process was "north high south low" situation, and the key ridge area centered in Lake Baikal, while the central-eastern process was "north high-south low" and "west low-east high" coexisted, the key ridge area extends from the Ural Mountains to Lake Baikal. The anomalous circulation of the two processes was related to the eastward propagating wave train of the North Atlantic Ocean. (2) The Ural Ridge began to develop three days before the southwestern process took place, and then moved east to Lake Baikal, forming a stable situation, while the Ural Mountain-Baikal ridge region of the central-eastern process began to develop one week before the process and reached its strongest on the start date.Both processes are accompanied by Mongolian high pressure moving southeast to make the ground cooling. The ridge area at 500 hPa ahead of the Mongolian high pressure two days change. The cooling of the southwestern process was mainly influenced by cold advection and adiabatic cooling, while the central-eastern process was influenced by cold advection.(3)The water vapor of southwestern process came from the Bay of Bengal area,influenced by the southern branch trough.Differently, the water vapor of central-eastern process came from the Bay of Bengal, the South China Sea and the western Pacific, influenced by the southern branch trough and the West Pacific subtropical high.The positive balance of water vapor in the two processes mainly comes from the southern boundary.The above research results can provide references for forecasting the persistent low temperature rain and snow process in southwestern and central-eastern of southern China.

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孫曉娟,陳躒,盧楚翰,秦育婧.我國(guó)南方西南和中東部區(qū)域兩次持續(xù)性低溫雨雪過(guò)程與關(guān)鍵環(huán)流系統(tǒng)的關(guān)系研究.氣象科學(xué),2024,44(2):267-279 SUN Xiaojuan, CHEN Li, LU Chuhan, QIN Yujing. Study on the relationship between two persistent low temperature rain and snow processes of southwestern and central-eastern of southern China and key circulation systems. Journal of the Meteorological Sciences,2024,44(2):267-279

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收稿日期:2022-07-12
最后修改日期:2022-10-17
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在線發(fā)布日期: 2024-05-17
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